Blower unit and combined heater cabinet-blower unit



April 10, 1956 K. s. JENSON BLOWER UNIT AND COMBINED HEATER CABINET-BLOWER UNIT 3 Sheets-Sheet 1 Filed Sept. 28 1951 i w H a QC 2 VM April 10, 1956 K. s. JENSON BLOWER UNIT AND COMBINED HEATER CABINET-BLOWER UNIT 5 Sheets-Sheet 2 Filed Sept. 28, 1951 INVENTOR. Kf/v/v/sm 5. LZf/KSO/V April 10, 1956 K. s. JENSON 2,741,243

BLOWER UNIT AND COMBINED HEATER CABINET-BLOWER UNIT Filed Sept. 28, 1951 3 Sheets-Sheet 3 T m i /00 /24 #5 M2 INVEN TOR. Kim/Em 5 JE/VSO/V United States Patent BLOWER UNIT AND COMBINED HEATER .CABlNET-BLGWER UNIT Kenneth S. Jensen, Wisconsin Rapids, Wis., assignor to Preway Inc., Wisconsin Rapids, Win, a corporation of Wisconsin Application September 28, 1951, Serial No. 248,738 8 Claims. (1. 126-116) V This invention relates to a blower unit for use with a heater cabinet of the type inwhich a combustion chamher is positioned Within a surrounding cabinet and the combination thereof. In the description to follow, the heating unit is exemplified by an oil burner which is disposed within the lower end of an upright combustion chamber in the form of a cylindrical drum which is disposed within the cabinet in spaced relation to its walls and top. A space heater of this general description is well suited for small homes, stores, shops and the like.

For its objects my invention here is concernedv with a blower unit in combination with a heater; with the construction of the heater cabinet which facilitates the attachment thereto of the blower unit on the cabinet rear wall over an opening therein provided by displacement of a knockout closure section; with a discharge nozzle forming part of the blower unit which forces a thin stream of air over a primary heating surface to be reheated preliminary to its delivery from the cabinet; with certain details of the blower unit itself whereby protection is afforded to its operating motor; with the means provided for releasably and expeditiously mounting the blower unit on the cabinet rear wall without involving any operations interiorly of the cabinet; and with various other features of construction which will be specifically referred to hereinafter.

Objects and purposes such as these, and also others which will be hereinafter noted, may be realized from a construction such as is illustrated in the accompanying drawings wherein:

Figure 1 is a plan view of a space heater to which is afiixed the blower unit of my invention;

Fig. 2 is a view in vertical section taken on line 2-2 of Fig. 1;

- Fig. 3 is a side elevation of the blower unit with a portion of its housing broken away to exhibit the construction of the rotor therewithin;

Fig. 4 is an enlarged elevational view showing certain details of the attaching means for the blower unit, the view being confined to the area within the circle marked x in Fig. 3;

Fig. 5 is a view in front elevation of the blower unit;

Fig. 6 is a fragmentary view in elevation of the rear wall of the heater cabinet, showing the knockout panel provided therein adjacent the flue thimble which extends outwardly of the wall;

Fig. 7 is a horizontal section taken on the offset line 7-7 of Fig. 2;

Fig. 8 which is a view similar to Fig. 3 exhibits a mod ification in the supporting means for the blower unit on the rear wall of the cabinet;

Fig. 9 is. a fragmentary elevational view showing the outlet opening in the cabinet rear wall where mounting of the blower unit takes place;

Fig. 10 is a vertical sectional view through the blower unit, housing, taken on line 10-10 of Fig. 8;

Fig. 11 is a fragmentary view in plan taken on the plane of line 11-11 of Fig. 8;

Fig. 12 is an enlarged fragmentary detail in section taken on line 12-12 of Fig. 10; and

Fig. 13 is a similar view taken on line 13-13 of Fig. 10.

The space heater herein illustrated comprises a cabinet C having a front wall 10 rising from a bottom 11 and joining with side walls 12 which are interconnected by a rear wall 15. A top wall 16 is carried by and supported by the remaining vertical walls. The cabinet top is provided with a grille which may comprise a plurality of forwardly inclined depending louvers 17 which define between them narrow vertical slits. If desired, the cabinet may be supported slightly olf the floor as by means of a plurality of feet (not shown).

Within a cabinet of this general description is a platform raised slightly from the bottom for support of an upstanding combustion chamber in the form of a drum D. The top 20 of the drum is slightly upwardly convex in contour and spaced from the cabinet top wall 16 a substantial distance to provide therebetween a horizontal passageway t having at its front a forwardly inclined depending batfie shield 21. This baffle shield provides, in efiect, a louver to deflect downwardly the air passing out through an elongated delivery opening 0 therebelow formed in the front of the cabinet and defined in part by a head plate 22 also extending downwardly and forwardly from a point adjacent the drum top 20 at its front toward an outstanding panel 23 which may constitute a door for the cabinet front wall it). If desired, this head plate 22 may be apertured at 24 in the form of a grille, both for ornamentation and to provide escape openings for air ascending through the passageway a between the drum and the cabinet front panel 23. This panel extends for the maior portion of the width of the cabinet (see Fig. 7) and down to a point relatively close to the bottom thereof. Closely below the panel is an elongated slot 25 extending crosswise of the cabinet to provide therefor an inlet opening for air which is to be circulated upwardly therewithin. Another inlet opening in the form of an elongated slot 26 may also be provided in the rear wall 15 at a point close to the cabinet bottom for the same purpose.

The heating drum D is positioned centrally within the cabinet so as to be spaced from all its walls, including the top 16 below which the horizontal top passageway t is provided. Within the drum in its bottom region is placed a burner P, here shown as of the pot type, to which fuel oil may be fed through a pipe 30 which leads from a control unit 31. A supply tank 32 supported at the rear of the cabinet between bracket plates 33 is connected by a pipe 34 with the control unit to assure a gravity feed of oil thereto for operation of the burner.

From an opening in the rear side of the drum D, in its upper region, is extended a flue thimble 36, passing through the rear wall 15 of the cabinet to connect with the elbow 37 of a flue pipe 38 for eduction of the products of combustion into a stack or chimney (not shown). So that this thimble may be of minimum length, it is located in the center of the back wall of the cabinet and relatively close to its top so as to connect with the heating drum at a high up point.

The space heater thus far described is complete and operative as a natural circulating type of heater. The air entering through the base inlet openings 25 and 26 is free to ascend along the heating drum within the passageway b' rearwardly thereof, and also within the somewhat wider passageways 0 upon opposite sides thereof. To a certain extent this is true also of the air ascending within the front passageway a which may be partly closed at the :5 top, by the head plate in this upward movement the air is raised to a high temperature by convection, and in this condition escapes through the grille in the cabinet top 16, and perhaps also through grille openings in the head plate 22, if provided therein, to enter the room into which additional heat is also transferred by radiation from the heated walls of the cabinet. A space heater so operating is effective to heat a room but only within a short radius; it cannot operate effectively, as does a forced cireulator type of heater, to deliver the heat to a more distant point. To provide for a forced circulation and discharge of the heated air through the delivery opening i at the front of the cabinet near its top, and thereby convert the heater to one of the forced circulator type, I

have arranged blower means of a novel character now to be described.

'uuit fits over an opening k formed by displacement of a knock-out section K having its margins spaced very slightly by a narrow slit 46 from the cabinet rear wall 15 to which it may remain connected by tenuous webs 41. Such a section may readily be displaced from the cabinet wall with which it is initially joined integrally by pressing its opposite ends inwardly and then bending the panel back and forth until it becomes loose and free. The opening k vacated by the knocked-out section K is located in part over the thimble 36 (see Fig. 6). It also extends laterally to one side of the thimble and angularly in a downwarddirection with its low end formed substantially as a semi-circle. Three holes h are also provided through the cabinet wall 15, one below the low end of the opening k, one thereabove, and the other beyond the high end thereof.

' V The blower unit B comprises an elongated housing 45 which at one end is enlarged and rounded in the general form of a scroll s, the housing extending laterally therefrom to provide a duct (1 whose rear Wall is curved around forwardly in the form of an elbow (see Fig. 1). This duct opens out in the form of a generally rectangular mouth opposite the wall opening k at a point above the fiuethimble 36 (see Figs. 5 and 6) where it joins with a nozzle N from which the heated air issues in the form of a stream which is vertically thin and horizontally wide. Anchored to the housing rear wall are a plurality of bolts 42 which extend outwardly therefrom for insertion through the holes 11 to receive thereon units 4-3 which engage the inner face of the cabinet rear wall 15. Spacer sleeves 44 fitted upon these bolts between the cabinet wall 15 and the housing rear wall complete the assembly of the parts required for mounting of the blower unit on the cabinet. 7

The nozzle N is'secured fixedly to the forward side of the blower housing so as to require no other support. As shown, this nozzle comprises a lower channel piece 47 facing an upper channel piece 43 to which it is joined, both channel pieces being upwardly inclined, but the former more so than the latter so as to be in converging relation therewith. The upper channel piece continues on beyond the lower channel piece to provide a shield 50 having depending flanges along opposite edges, the shield at its forward end 51 executing a slight downward bend, as shown. A nozzle of this description will conduct the heated air coming from the blower to a point substantially at the top 16 of the cabinet (see Fig. 2}, and in so doing will transform the stream of air moving out of the blower to one which is relatively wide (horizontally) and thin (vertically) at the point of its issuance from the nozzle into the top passageway t.

i In Fig. 7 I have indicated by the broken lines y and 2 approximately the extent of laterally diverging spread of the heated air following its discharge from the nozzle N. The air isdelivered first into the top chamber t at a point directly over the top 20 of the heating drum D where it the delivery opening a in the cabinet front at a point close to its top.

The blower unit B comprises also a rotor 55 (see Fig. 3) which may take the form of the conventional squirrel cage, the rotor being located eccentricallyin the scroll end s of the blower housing .(see Fig. 5)' where a large circular inlet opening thereinto is fitted with a collar 56. This rotor is carried by a shaft 7 which extends through one end of a housing M containing an electrical motor so as to be directly driven thereby.

The motor housing M is ailixed at one end to a vertical base plate 69 (see Fig. 4) formed with a plurality of offset feet 61 through each of which is extended a bolt 62 which passes also through a bracket plate 65 and on through a spacer sleeve 66. Continuing, this bolt also passes through a shield 67 spaced from the bracket plate 65 and from the proximate rear wall of the housing 45 through which the bolt is extended to present its head 68 against the inner face thereof. A lock nut 59, also threaded onto' the bolt, may engage with the outer face thereof. By some such means as this each bolt is carried rigidly by the blower housing rear wall from which it extends outwardly to secure the various parts just described. Threaded onto each bolt upon opposite sides of the feet 61 of the base plate are grommets 70 'to the outer side of which are arranged washers, a nut 72 being threaded onto the bolt to exert a clamping pressure on all the parts carried thereby. Such an assembly is desirably provided for each foot of the base plate to secure the motor immovably upon the exterior of the rear wall of the blower housing.

The bracket plate 65 which stands in spaced rela-' each by an air gap which is open on all sides so as to further prevent the transmission of heat outwardly toward the motor. Since the motor is spaced laterally from the flue pipe 38 by only a short distance (see Fig. l), I have arranged at the end of the bracket plate 65 a lateral extension 75 which serves as a shield to protect the motor against excessive temperature at that point.

The collar 56 surrounding the inlet opening into the blower housing is formed to provide frictional bearings 78 for a rod 80 one end of which is turned to provide a crank 81. Aflixed to this rod and concentric with the circular collar 56 is a damper 82 which, in the position of Fig. 5, substantially closes the inlet opening into the blower housing. The operating crank 81 may be turned to adjust this damper to any selected rotative position whereby to control the amount of heated air entering into the blower housing.

Electrical energy for operating the motor is conducted through insulated wires contained in an extension cord 85 which is encased for a substantial distance by a conduit pipe 86 having brackets 87 and 88 to facilitate its fixed attachment to the rear wall of the cabinet. By the provision of such a conduit pipe extending fromja point adjacent the motor downwardly toward the lower end of the cabinet, ample protection is afforded to the extension cord against excessive heat which otherwise might prove dangerous to the electrical connection.

Referring now to Figs. 8-13, the blower unit'B is the same as that already described in that it comprises an elongated housing enclosing a rotor driven by a motor M that is carried exteriorly of the housing. In one of its walls 100, the housing is provided with a circular inlet opening surrounded by a collar 156 having its center coaxial with the rotor 155. The rotor-motor unit which is relatively heavy is located at a low point and in a downwardly enlarged end portion ofthe housing 145. At its opposite end the housing is vertically narrowed and of relatively lightweight where it carries a laterally extending nozzle N that is located at a relatively high point.

The means whereby such a blower unit housing is attached to the rear wall 115 of the heater cabinet is also a feature of this invention. In this construction the blower unit is pivotally attached at a point adjacent its narrow light end and is releasably hung near its top at its opposite downwardly-extending heavy end, spacer means being provided between the blower unit B and the cabinet rear wall 115 to maintain a fixed extent of separation therebetween. Bythis' arrangement the blower unit may be conveniently installed or removed with all operations performed exteriorly of the cabinet.

In the wall 115 at the rear of the cabinet there is formed an elongated opening 1: whichin an upper end portion at is disposed horizontally, its other end portion 1 being angled downwardly in general conformity with the blower housing wall 100. Three holes are formed through the cabinet wall 115 adjacent its opening k, the first I21 adjacent and laterally of its upper end portion a, the second k2 adjacent and below the lower end portion 1 thereof, and the third k3 adjacent and above the downwardly angled portion 1 of the opening 1:. When the blower unit B is operatively mounted on the cabinet over the elongated outlet opening k in its rear wall 115, the housing wall 100 will lie proximate thereto in covering relation thereto.

The hole 111 adjacent the high end portion u of the opening k is occupied by a bolt 101, whose head 102 engages the inner face of the cabinet wall 115 (see Fig. 11). Threaded upon the shank of this bolt is a nut 103 engaging the outer face of the wall 115 whereby to secure the bolt fixedly in place. A bracket formed with an apertured foot 104 is extended from the narrow lighter end of the blower housing to be fitted over the shank of the bolt 101 and secured thereto as by a second nut 105. Since the bolt is at all times extended rearwardly from the cabinet ready to receive the foot 104 of the blower housing, it is obvious that the operation of attaching this end of the housing to the cabinet may be performed both conveniently and expeditiously.

Near the opposite larger end of the blower housing is a key-hole slot 106, small end up, formed in the rear wall 100 of the housing adjacent its top (see Fig. This slot is positioned oppositely of a bolt 107 (see Fig. 12) which is extended through the upper hole h3 near the low end of the opening k. The head 108 of this bolt engages a knob 10? which is connected to, but spaced from, a tubular cylindrical body 110 by means of a neck 111, Whose diameter is slightly less than the width of the key-hole slot 106 at its upper narrow end. A nut 112 which is screwed onto the bolt shank 107 engages a spring washer 113 which bears against the inner face of the cabinet rear wall 115. When this nut is tightened, the bolt head 108 will exert an axial pressure against the knob 109 thereby to press the body 110 against the outer face of the cabinet wall 115. This fitting which remains imrnovably in place serves to support the proximate larger end of the blower housing when the key-hole slot 106 is manipulated over the knob 109 to position the narrow upper end of the slot in engagement with the neck 111. As clearly shown in Fig. 10, the blower housing at this end is then suspended near its top, and with its opposite end connected to the belt 101 a secure mounting of the housing 145 upon the cabinet wall 115 is assured.

The lower hole k2 adjacent the low end of the opening k is occupied by a bolt120 which is extended through a spacer sleeve 121 exteriorly of the cabinet wall 115. The bolt head 122 engages the outer end of the sleeve, and when a nut 123 is applied to the bolt and tightened 6 against a spring washer 124, the entire assembly will be secured immovably to the cabinet wall 115 oppositely of a cushion head 125 having a shank 126 extendedthrough a hole in the housing wall to position its body 127 upon the inner side thereof.

The preponderance of weight of the blower housing is low down, in its larger end, and below the supporting bolt 101 and knob 109, so that the housing in its lower portion will tend to swing inwardly into engagement with the cabinet Wall 115. It is at this point that the cushion head 125' is placed oppositely of the bolt head 122 so as to remain normally engaged therewith.

With a construction answering to this description, attachment of the blower unit maybe readily made by removing the outer nut from the bolt 101 so as to permit fitting of the apertured foot 104 thereover. The nut 105 is replaced then or later. The opposite larger end of the blower unit is then manipulated to position its key-hole slot 106 over the knob 109 in locking engagement therewith. When done, the housing in its lower portion will remain swung inwardly toward the cabinet wall with its cushion head in pressure engagement with the bolt head 122, as just described. The nut 105 is rotatably advanced to its final position to complete the mounting of the blower unit in its operative position.

The nozzle N is, of course, projected forwardly through the upper end portion of the elongated opening k in the cabinet wall (see Fig. 8). Desirably this end of the opening should be substantially fully occupied by the nozzle, when the blower unit is mounted in operating position, to prevent loss of heat therethrough from within the cabinet. At the same time, there must be some clearance vertically of the nozzle to provide for adjusting movements of the blower housing when manipulated during installation upon or removal from the cabinet. To meet these contingencies 1 provide a recess 130 extending transversely across the top of the nozzle N, thereby to provide a sufficient clearance for slight movements of the nozzle, both upwardly and horizontally and toward and from the cabinet wall 115. Such movements will be required during the operation of installing the blower unit upon the cabinet wall, or when etfecting its removal therefrom. When installed, the amount of clearance will be very slight, and the upper face of the nozzle adjacent the recess 130 will be substantially even with the top of the opening k so as to minimize any outflow therethrough of heated air from within the cabinet.

It is to be noted that the blower unit comprises a motor, which is relatively heavy, carried on the side of the blower housing which is opposite its wall 100, and that the location of this motor is also at a relatively lowdown point toward one end of the housing. As a result, there is at the larger end of the housing a preponderance of weight disposed exteriorly thereof so as to create, by gravity, a strong force tending to swing the larger end of the housing in its lower portion inwardly toward the wall 115 whereon the housing is suspended in its upper portion. 1 take advantage of this to simplify the attaching means which are confined to the bolt 101 whereon the lightend of the housing is pivotally supported and to the bolt 107 on whose associated knob 109 the heavy end of the housing is releasably supported; in so doing I also assure, through the weighted motor on the outside of the housing, the maintenance of a force which tends to hold the lower end of the housing inwardly with pressure against the abutment 122 that is provided by the bolt 120. The cushion head 125 is a desirable feature, inasmuchas it absorbs any vibration which otherwise might produce some noise at the point of contact.

The blower unit of this invention is attachable to an existing heater cabinet, or may be aflixed thereto at the time of its manufacture or sale. For convenience in shipping, and otherwise, it may be preferred to install the blower unit on the cabinet at or about the time that the space heater is to be delivered for use; This blower'unit I is designed for atfixation to the cabinet rear wall at the point where it will be most efficient in operation, i. e.,

this high-up level the air ascending through the passages a, b, c and d will have attained its highest degree of ternperature. It is at this point that. the air is drawn into the blower through its inlet opening and then circulated therethrough and out again through the forwardly extending nozzle directly over the top of the heating drum. Here a reheating of the air takes place preliminary to its discharge from the cabinet at the front. By this arrangement the blower circulates and discharges heated air which has reached a point of maximum temperature, and just prior to its emergence from the cabinet reheats the air so that at the moment of its delivery into the room its temperature is at the very highest point.

By the various other minor features hereinbefore described l safeguard the motor from the surrounding temperatures which may be considerable. On the two sides which are proximate to the cabinet and to the flue the motor is protected by shields with intervening air spaces which will promote ventilation. The resilient grommets employed in connection with the bolts which secure the motor base to the cabinet rear wall serve also to eliminate virbration and noise. The motor al hough positioned in a zone or" relatively high heat may be depended upon to operate over a long period without danger due to the protection afforded by the means described.

'The blower unit of this invention as to most of its features has previously been disclosed in my application filed November 18, 1947, under Serial No. 786,651 of which this case is a continuation-in-part. This application matured into Patent No. 2,576,685 on November 27, 1951.

I claim:

1. In a combination with a blower unit having an elongated housing with a wall wherein is an inlet opening near one end of the housing at a relatively low point and substantially oppositely of a rotor within the housing and an outlet opening on the same side of the housing as said inlet opening, and a cabinet having a wall wherein is an elongated opening formed at one end with a horizontally extended portion and with a downwardly angled portion at its opposite end, and provided also with three holes, the first adjacent and laterally of the horizontal upper end portion of the opening, the second adjacent and below the angled lower end portion of the opening, and the third adjacent and above the downwardly angled end portion of the opening; means for releasably mounting the blower unit on the cabinet with the inlet wall of the blower unit in covering relation with the elongated opening in the cabinet wall and the blower inlet opening communicating with the opening in the cabinet wall, comprising a threaded shank anchored in the first hole of the cabinet wall and extending horizontally outwardly therefrom and exteriorly thereof, apertured means at one end of the blower unit housing engageable with the shank to be fixedly supported thereby and locked thereto, an abutment having means inserted within the cabinet wall second hole to be'fixedly supported thereat in a position 'cxteriorly of the cabinet wall, a cushion afiixed to the blower housing wall at a point oppositely of the abutment and arranged for freely separable engagement therewith, and av knob arranged exteriorly of the cabinet wall having supporting means extended through the third hole and anchored fixedly to said wall, the inlet wall of the blower unit housing being formed with a key-hole slot, small end up, engageable with the knob to be releasably supported thereby, the preponderance of weight of the blower unit being substantiallyrlow in its housing and outwardly of its wall proximate to the cabinet whereby the blower unit lower portion is gravity-swung inwardly to maintain its cushion in pressure contact with the abutment and its inlet housing wall disposed closely adjacent the outlet in the cabinet wall.

gatedhousing with a wall wherein is an inlet opening near one end of the housing at a relatively low point and substantially oppositely of a rotor within the housing, and

with an outlet nozzle in communication with said rotor and 7 extending laterally from the same side of the housing as said inlet opening near its opposite end, and a cabinet 7 having a wall wherein is an elongated opening formed at one end with an angled portion joining with a horizontally extended upper portion at its opposite end for reception therethrough of the blower housing nozzle; means for releasably mounting the blower unit on the cabinet with the inlet wall of the blower unit in covering relation with the elongated opening in the cabinet Wall and the, blower inlet opening communicating with the opening .in the cabinet wall, comprising a releasable horizontal pivotal connection therebetween adjacent and laterally of the upper horizontal end portion of the elongated opening, and a releasable hook connection therebetween adjacent and above the lower angled portion of the opening and laterally spaced from said pivotal connection, the nozzle having a top wall across which is a recess confronting the top edge of the elongated outlet opening to provide a slight clearance in the cabinet wall for vertical pivotal movements of the housing incidental to its effecting a hook connection with the cabinet wall.

3. In combination with a blower unit having an elongated housing with a wall wherein is an inlet opening near one end thereof at a relatively low point oppositely of a rotor within the housing, an outlet opening in said housing, and a heater cabinet having a wall wherein is an elongated opening formed at one end with a horizon tally extended portion and with a downwardly angled portion at its opposite end; means for releasably mounting the blower unit on the cabinet with the inlet wall of the blower housing in covering relation with the elongated 7 opening of the cabinet wail, said inlet opening in the housing wall communicating with said opening in the cabinet wall, comprising a releasable horizontally disposed pivotal connection therebetween adjacent and laterally of the upper end portion of the opening, and a releasable hook connection therebetween adjacent and above the downwardly angled end portion of the opening and laterally spaced from said pivotal connection.

4. In combination with a blower unit having an elongated housing with a wall wherein is an inlet opening near one end thereof at a relatively low point oppositely of a rotor within the housing, and a heater cabinet having a wall wherein is an elongated opening formed at one end with a horizontally extended portion and with a downwardly angled portion at its opposite end; means for releasably mounting the blower unit on the cabinet with the inlet wall. of the blower housingjin covering relation with the elongated opening of the cabinet wall and the blower inlet opening communicating with the opening in the cabinet wall, comprising a releasable horizon-tally disposed pivotal connection thcrebetween adjacent and laterally of the upper end portion of the opening, a releasable hook connection therebetween adjacent and above the downwardly angled end portion of the opening and laterally spaced from the pivotal connection, and an outlet in communication with said rotor and fixed to the blower housing upon its inlet opening wall and extending'therefrom laterally into the cabinet through the horizontally extended portion of its opening and having upper and lover walls in close proximity to the upper and lower edges of the opening, the nozzle having a recess extending across one of its said walls opposite the. proximate opening edge to provide therebetween a slight clea..- ance whereby to permit vertical pivotal movements of the housing incidental to its effecting a hook connection with the cabinet wall.

3. in combination with a blower unit having an elon- 2. In combinan'on with a blower unit having anelone gated housing with a wall wherein is an inlet opening near one end thereof at a relatively low point oppositely of a rotor within the housing and a motor exteriorly of the housing oppositely of the rotor constituting a preponderance of the weight at that point, said housing having an outlet opening on the same side or" the housing as said inlet opening, and a heater cabinet having a wall wherein is an elongated opening at one end formed with a horizontally extended portion and with a downwardly angled portion at its opposite end; means for releasably mounting the blower unit on the cabinet with the inlet wall of the blower housing in covering relation with the elongated opening of the cabinet wall and the blower inlet opening communicating with the opening in the cabinet wall, comprising a releasable pivotal connection on a horizontally disposed axis therebetween adjacent and laterally of the upper end portion of the opening, a releasable hook connection therebetween adjacent and above the downwardly angled end portion of the opening and laterally spaced from the pivotal connection, and cushion means therebetween adjacent and below the lower end portion of the opening to receive the lateral pressure at that point resulting from gravity action of the motor outwardly thereof.

6. A blower unit for use with a heater having a cabinet wall with a continuous elongated opening, comprising an elongated housing having an opening surrounding side, said side of the housing having spaced inlet and outlet openings for receiving air directly from and discharging air directly to said heater, a squirrel cage blower mounted within the housing for rotation about an axis oppositely of the inlet aperture thereof, a motor mounted exteriorly of the housing coaxially of the blower and in driving connection therewith, and a nozzle carried by the blower housing in surrounding relation to its outlet opening and extending therefrom for discharge of air at a point removed from said outlet, said nozzle comprising relatively flat upper and lower channel pieces joined together and converging toward each other in a slightly upward direction, the upper channel piece extending beyond the lower channel piece to form a shield portion having a slight downward bend.

7. A motor blower unit for use with a heater having an interior and a cabinet wall provided with a continuous elongated opening, comprising an elongated blower housing having a size and shape to fit over the cabinet wall opening and beyond the margins thereof and with a wall which is adapted to confront the cabinet wall formed therethrough with spaced inlet and outlet openings adapted to communicate with the heater cabinet interior through the elongated opening in the cabinet wall, pivotal fastening means secured to an end of the blower housing wall having the inlet and outlet openings, a slot in said blower housing Wall having the inlet and outlet openings laterally spaced from said fastening means and adjacent the top or" said housing wall, to provide a releasable hook connection for the blower housing, abutment means near the bottom of said blower housing wall and beneath said slot for spacing the bottom of the blower housing from the heater cabinet, a blower mounted within the housing for rotation about an axis oppositely of the inlet aperture in the housing and a motor supported on the housing and drivingly connected to the blower.

8. A heater cabinet and a motor blower unit removably attached thereto comprising, in combination, a heater cabinet wall having a continuous elongated opening and having first and second fastening element holes laterally spaced apart on opposite sides of said opening, a fastening knob extending from the first of said holes, an elongated blower housing having a size and shape to fit over the cabinet wall opening and beyond the margins thereof and having a wall conironting the cabinet Wall, said wall confronting the cabinet wall formed with spaced inlet and outlet openings, both in communication with the heater cabinet interior through the elongated opening in the cabinet wall, fastening means secured to the blower housing on the same side thereof as said inlet and outlet openings including a bolt extending through the second of said fastening element holes and forming a releasable pivotal connection disposed on a horizontal axis for the blower housing, the wall of the blower housing having the inlet and outlet openings having a slot therein in releasable engagement with said knob to secure the blower unit to the heater cabinet and motor-driven blower means mounted within the housing for rotation about an axis oppositely of the inlet aperture in the blower housing wall.

References Cited in the file of this patent UNITED STATES PATENTS 690,789 Stoltz Ian. 7, 1902 1,917,029 Good July 4, 1933 2,086,377 Bryan July 6, 1937 2,175,539 Moule Oct. 10, 1939 2,242,616 OBrien May 20, 1941 2,253,175 Gerquest Aug. 19, 1941 2,375,920 Hewitt May 15, 1945 2,376,172 Mueller May 15, 1945 2,479,906 Cole Aug. 23, 1949 2,576,685 Jonson Nov. 27, 1951 FOREIGN PATENTS 206,144 Switzerland Nov. 1, 1939 

